/*  
 * Copyright 2008 CoreMedia AG, Hamburg
 *
 * Licensed under the Apache License, Version 2.0 (the License); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0 
 * 
 * Unless required by applicable law or agreed to in writing, software 
 * distributed under the License is distributed on an AS IS BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 */

package com.coremedia.iso.boxes;


import com.coremedia.iso.IsoTypeReader;
import com.coremedia.iso.IsoTypeWriter;
import com.googlecode.mp4parser.AbstractFullBox;

import java.nio.ByteBuffer;

import static com.googlecode.mp4parser.util.CastUtils.l2i;

/**
 * This box containes the sample count and a table giving the size in bytes of each sample. Defined
 * in ISO/IEC 14496-12.
 */
public class SampleSizeBox extends AbstractFullBox {
  private long sampleSize;
  private long[] sampleSizes = new long[0];
  public static final String TYPE = "stsz";
  int sampleCount;

  public SampleSizeBox() {
    super(TYPE);
  }

  /**
   * Returns the field sample size. If sampleSize > 0 every sample has the same size. If sampleSize
   * == 0 the samples have different size as stated in the sampleSizes field.
   *
   * @return the sampleSize field
   */
  public long getSampleSize() {
    return sampleSize;
  }

  public void setSampleSize(long sampleSize) {
    this.sampleSize = sampleSize;
  }


  public long getSampleSizeAtIndex(int index) {
    if (sampleSize > 0) {
      return sampleSize;
    } else {
      return sampleSizes[index];
    }
  }

  public long getSampleCount() {
    if (sampleSize > 0) {
      return sampleCount;
    } else {
      return sampleSizes.length;
    }

  }

  public long[] getSampleSizes() {
    return sampleSizes;
  }

  public void setSampleSizes(long[] sampleSizes) {
    this.sampleSizes = sampleSizes;
  }

  protected long getContentSize() {
    return 12 + (sampleSize == 0 ? sampleSizes.length * 4 : 0);
  }

  @Override
  public void _parseDetails(ByteBuffer content) {
    parseVersionAndFlags(content);
    sampleSize = IsoTypeReader.readUInt32(content);
    sampleCount = l2i(IsoTypeReader.readUInt32(content));

    if (sampleSize == 0) {
      sampleSizes = new long[(int) sampleCount];

      for (int i = 0; i < sampleCount; i++) {
        sampleSizes[i] = IsoTypeReader.readUInt32(content);
      }
    }
  }

  @Override
  protected void getContent(ByteBuffer byteBuffer) {
    writeVersionAndFlags(byteBuffer);
    IsoTypeWriter.writeUInt32(byteBuffer, sampleSize);

    if (sampleSize == 0) {
      IsoTypeWriter.writeUInt32(byteBuffer, sampleSizes.length);
      for (long sampleSize1 : sampleSizes) {
        IsoTypeWriter.writeUInt32(byteBuffer, sampleSize1);
      }
    } else {
      IsoTypeWriter.writeUInt32(byteBuffer, sampleCount);
    }

  }

  public String toString() {
    return "SampleSizeBox[sampleSize=" + getSampleSize() + ";sampleCount=" + getSampleCount() + "]";
  }
}
